ath79: drop redundant status for gpio target-wide

All definitions of gpio in SoC DTSI files do not set status, i.e.
have it enabled. This drops all remaining redundant "status = okay"
definitions in descendent files (mostly older ones).

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ath79/dts/qca9558_librerouter_librerouter-v1.dts

@@ -80,10 +80,6 @@
 	status = "okay";
 };
 
-&gpio {
-	status = "okay";
-};
-
 &usb_phy0 {
 	status = "okay";
 };